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Q.

An infinite wire bent in the form of I carries current i. What is the magnetic field at the point O ?

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a

zero

b

μ04π×ip

c

μ04π×i2p

d

μ0i(1+2)42πp

answer is D.

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Detailed Solution

B due to both parts is in the same direction and the two parts behave as semi infinite conductor .B = μ0 i4πp( sin 900+sin 450) =μ0i(1+2)42πp
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An infinite wire bent in the form of I carries current i. What is the magnetic field at the point O ?